package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class RefreshInterceptor implements HandlerInterceptor {
    private StringRedisTemplate stringRedisTemplate;
    public RefreshInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1 获取请求头中的 token
        String token = request.getHeader("authorization");
        if(StrUtil.isBlank( token)){

            return true;
        }
        System.out.println( "token有了");
        //2 基于token获取redis中的用户
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash()
                .entries(RedisConstants.LOGIN_USER_KEY + token);
        //3 判断用户是否存在
        if (userMap.isEmpty()) {

            return true;
        }
        //5 将查询到的hash数据转为UserDTO
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);

        //6 存在，放行 保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);
        //7 刷新token有效期
        stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY + token,
                RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        //8 放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserHolder.removeUser();
    }
}
